Fan.



- s. VIVIANO I FAN. APPLICATION FILED AUG-22,1917.

1,279,381. I PatentedSept. 17,191:

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SALVATORE VIVIANO, OF ST. LOUIS, MISSOURI.

FAN.

Specification of. Letters Patent.

Patented Sept, 1?, was.

Application filed August 22, 1917. Serial No. 18?,815.

To all whom it may concern:

Be it known that I, SALVATORE Vivnin'o, a citizen of the United States, residing at St. Louis, Missouri, have invented a certain new and useful Improvement in Fans, of which the following is a full, clear, and exact description, 'such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to rotatable fans, and particularly, to fans of the kind that are used for causing air to circulate through a compartment Containing material which requires drying.

The main object of my invention is to provide a fan which is so constructed that it will produce a substantially uniform and equal distribution of air throughout the entire-area of. a passageway in which the fan is arranged centrally with its axis parallel to the longitudinalaxis of said passagewity.

Another object isto provide a strong/and inexpensive fan having the characteristics above mentioned and also the added advan tage of blades which are .of'such cross-sectional shape that the air-ofi ers very little resistance to their forward movement.

To'this' end I have devised a rotatable fan comprising blades arranged at right angles to the axis of the fan and diminishing gradually in'width from their inner toward their outer end, the blades being so pro'por-' tioned that when the fan is in operation the volume of air discharged from the center of the fan will be substantially the same as the'volume of. air disohargedfrom the periphery of the-fan and the entire volume of air'set'in motion by the fan will travel longitudinally through the compartment or pas sageway in which the fan is arranged in a direction parallel to the axis of the fan,

thereby causing air to be distributed uniformly and equally throughout the entire 7 area of said compartment or passageway.

Figure 1 of Ythe'drawings -is a side eleva-- tional view of a fan constructed in accordance with my invention;

Fig. 2 isan edge view of said fan; and

Fig. 3 isja perspective view of the hub of the fan and the inner end portion of one of Referring to the drawings, which illustrate the preferred form of my invention A designates the hub of the fan'which pre erably. consists of a disk-shaped piece of metal provided at one side with. an integral sleeve 2, shown in Fig. .2, through which a iasten- 1ng device 3, such, for example, as a set screw passes, so as to secure the fan to the shaft to the axis of the fan so that when the fan;

is in operation the air set in motion by the blades will flow through the compartment or passageway in which the fan is arranged in a direction parallel to the longitudinal axis of said passageway. The longitudinal side edges of the blades 13 are tapered, preferably to a feather edge 5, as shown in Fig. 3, so that when the fan is in operation the air will offer very little resistance to the forward movement of the blades. The blades B can 'be made of any suitable material, but they are preferably made ot' wood and they can be connected to the hub A in various ways without departing from the spirit of my invention. I prefer, however, to provide each of the blades B at its inner end with a shank that is seated in a ratchet toothed notch 6 formed in one of the side faces of the disk A, the side otl said shank bearing against the inclined bottom face of the notch 6 and one edge of the shank hearing against the end wall 6 of said. notch.

The shank on the inner end of each blade B can be formed conveniently'of two flat strips.

of netal 7 that extend longitudinally of the blade on opposite sides of same and embrace a reduced. extension 7 at the inner end of due to the fact; that the blades are so proportioned that the volume of air discharged 

